# Kenworth T660 Used Price & Common Problems | Big Rig Risk

> Kenworth T660: used $22,900 to $69,950. Documented problems: loss of power and injectors and relief valve. What to inspect before you buy.

**Verdict:** inspect

Used Kenworth T660: $22,900–$69,950 observed used across 4 listings. The documented cost risk to price in: injectors at about $1,000 each and loss of power. Buy only after inspection.

**Observed used price:** $22,900–$69,950

**Documented failure risks:**
- Loss of power: A generic, non-chassis-specific loss-of-power diagnostic sequence begins with a pressure test.
- Injectors and relief valve: Injectors ~$1,000 each; relief valve flagged as a likely leak point during ISX teardown

## Sources
- [truckpaper.com](https://www.truckpaper.com/listings/for-sale/kenworth/t660/sleeper-trucks) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=G9GNcJfSmec) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=hhZhNY2_l7E) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=CrDuDh0DsbM) (accessed 2026-08-19)
- [dieselpro.com](https://dieselpro.com/blog/cummins-isx-history-specs-common-issues/) (accessed 2026-08-19)
- [4btengines.com](https://4btengines.com/top-isx15-problems/) (accessed 2026-08-19)
- [cylinder-heads.com](https://www.cylinder-heads.com/cummins-isx/) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=Vz2OVWLaFes) (accessed 2026-08-19)
- [dieselrebuildkits.com](https://dieselrebuildkits.com/) (accessed 2026-08-19)
- [soarr.com dealer inventory listings (4 real listings observed 2026-09-05)](https://www.soarr.com/for-sale/trucks/0/Kenworth/T660/all-for-sale) (accessed 2026-09-05)
- [NHTSA recall 15V310000 (POWER TRAIN:DRIVELINE:DRIVESHAFT)](https://www.nhtsa.gov/recalls?nhtsacampaignnumber=15V310000) — "PACCAR Incorporated (PACCAR) is recalling certain model year 2014 and 2015 Kenworth T660, T680, and T800 trucks manufactured January 29, 2013, to April 2, 2014, and 2013 Peterbilt 587 trucks manufactured on August 8, 2012.  The affected trucks are built with a driveshaft that may not transmit power to the wheels due to weld failure from corrosion." (accessed 2026-09-11)
- [NHTSA recall 08V280000 (LATCHES/LOCKS/LINKAGES:HOOD:LATCH)](https://www.nhtsa.gov/recalls?nhtsacampaignnumber=08V280000) — "PACCAR IS RECALLING 62 MY 2009 KENWORTH T660 TRUCKS.  THE 90 DEGREE STANDOFF MOUNTED ON THE FRONT BUMPER SUPPORT MAY COME INTO CONTACT WITH THE HOOD STRUT, WHICH MAY RESULT IN A NON-OPERATIONAL HOOD SAFETY LATCH.  THE SAFETY LATCH PREVENTS THE HOOD FROM CLOSING." (accessed 2026-09-11)

_Last verified 2026-09-11. Source: Big Rig Risk — https://bigrigrisk.com/trucks/kenworth-t660-cummins-isx15/ — every claim checked against a primary source before publication (see /methodology/)._